Anti-hole-collapse seabed drilling sampling device suitable for loose sediments

Abstract

The invention belongs to the technical field of seabed exploration, and particularly relates to an anti-sloughing hole seabed drilling sampling device suitable for loose sediments, which comprises a suspension platform, a double-pipe isolation sampling assembly and a loading assembly, a group of brackets are uniformly distributed on the surface of the suspension platform; the double-pipe isolation sampling assembly comprises a supporting pipe on the outer layer and a sampling pipe on the inner layer; a group of guide rods are uniformly distributed at the top of the supporting pipe; the guide rod penetrates through the suspension platform and is in sliding connection with the suspension platform; the upper end of the guide rod is fixedly connected with a stress plate; the stress plate is hammered intermittently through the loading assembly, the supporting pipe is promoted to be inserted into the seabed sediment, then the supporting pipe can play a role in supporting and enclosing the surrounding sediment, the hole collapse phenomenon in the sampling process is prevented, then the sediment in the supporting pipe is collected layer by layer through the sampling pipe, stratified sampling operation is achieved, and the sampling efficiency is improved. And disturbance to the sediments in the supporting pipe can be reduced to the greatest extent in the operation process, so that an almost original sediment sample can be obtained.

Description

Technical Field

[0001] This invention belongs to the field of seabed exploration technology, specifically a seabed drilling and sampling device for preventing collapse of loose sediments. Background Technology

[0002] Seafloor sediments serve as a natural archive of Earth's history, preserving complete stratigraphic sequences, fossils, and chemical signals. They reveal millions of years of paleoclimate evolution, paleoenvironmental changes, and major geological events, and the mineral resource information they contain is strategically significant for resource exploration. Traditional seafloor drilling and sampling equipment uses rotary cutting devices to drill into the seabed, which is unsuitable for soft sediments. This is because rotary cutting equipment easily disturbs the sediment during operation, making it impossible to collect truly pristine samples, which is detrimental to sample analysis.

[0003] Chinese patent application CN222668180U discloses a undisturbed deep-scale drilling and sampling device for seabed sand and soil sediments. The key technical features are: a perforated pipe and a deck, with a sampling structure installed at the perforated pipe; the sampling structure includes a rod-shaped weight inside the perforated pipe, with a guide on the outer surface of the weight. This guide is fixed to the inner wall of the perforated pipe by screws. Drainage holes are also provided on the side wall of the perforated pipe, and a sampling baffle is installed on the inner wall at the middle of the perforated pipe. This technology utilizes the downward movement of the rod-shaped weight within the perforated pipe to strike the sampling tube, minimizing sample disturbance and achieving a large sampling depth.

[0004] Seafloor sediments are typically formed by the accumulation of layers over time. The internal composition of different layers of sediments may differ, such as mineral composition, types of organic matter, microfossils, and biological communities. Therefore, when exploring seafloor sediments, it is best to sample each layer separately to reconstruct their true depositional phenomena. However, existing technologies often fail to achieve the desired results when applied to the above requirements. Due to the geological characteristics of loose sediments, hole collapse is prone to occur during the sampling process, which will hinder the implementation of layered sampling.

[0005] Therefore, the present invention provides a seabed drilling and sampling device suitable for preventing collapse of loose sediments. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is: the present invention provides a seabed drilling and sampling device for preventing collapse of loose sediments, comprising a suspended platform, a dual-tube isolation sampling assembly, and a loading assembly; The suspended platform is in a horizontal position; a set of supports is evenly distributed on the surface of the suspended platform; the bottom of the supports is fixed to the seabed; The dual-tube isolation sampling assembly is used to sample seabed sediments in an isolated state; the dual-tube isolation sampling assembly includes an outer support tube and an inner sampling tube; a set of guide rods are evenly distributed on the top of the support tube; the guide rods pass through the suspended platform and are slidably connected to it; a force-bearing plate is fixedly connected to the upper end of the guide rods; The loading component is used to intermittently hammer the load-bearing plate and cause the support pipe to enter the seabed sediment.

[0008] Preferably, the loading component includes a limiting cylinder fixedly connected to the upper side of the suspension platform; the force plate is located inside the limiting cylinder; a counterweight is slidably connected inside the limiting cylinder; and a connecting column and a steel cable are fixedly connected to the upper end of the counterweight in sequence.

[0009] Preferably, both the support pipe and the sampling pipe have beveled edges at their bottoms.

[0010] Preferably, the dual-tube isolation sampling assembly further includes a mounting plate, which is fixedly connected to the guide rod; a transmission rod is slidably connected to the middle of the mounting plate; a set of toothed blocks are evenly distributed on the surface of the transmission rod; a gear is rotatably connected to the surface of the mounting plate, and the gear is driven by a motor; the gear meshes with the toothed blocks on the surface of the transmission rod.

[0011] Preferably, a connecting block is fixedly connected to the upper end of the sampling tube; the connecting block is connected to the lower end of the transmission rod by a thread.

[0012] Preferably, a set of drainage holes are evenly distributed on the top side of the sampling tube.

[0013] Preferably, an annular elastic pad is fixedly connected to the inner wall of the top of the sampling tube at the position corresponding to the drainage hole; the elastic pad is inclined upward and there is a gap between it and the inner wall of the sampling tube.

[0014] Preferably, an inner mounting ring is fixedly connected to the inner wall of the bottom of the sampling tube; a set of triangular plates in a ring array are hinged to the surface of the inner mounting ring by a pivot pin and a torsion spring; a guide block is fixedly connected to the end of the triangular plate; and an electromagnet is provided at the corresponding position of the guide block inside the side wall of the sampling tube.

[0015] Preferably, an outer mounting ring is fixedly connected to the bottom outer wall of the sampling tube; a set of annular array of paddles is hinged to the surface of the outer mounting ring by a pivot pin and a torsion spring; a guide block is fixedly connected to the end of the paddle; and an annular elastic cloth is fixedly connected between the outer side of the paddle and the outer mounting ring.

[0016] Preferably, an annular rubber magnet is fixedly connected to the top of the elastic fabric.

[0017] The beneficial effects of this invention are as follows: 1. The present invention provides a seabed drilling and sampling device for loose sediments that prevents borehole collapse. By intermittently hammering a load-bearing plate with a loading component, the load-bearing plate, guide rod, and support pipe gradually move vertically downwards until the support pipe is fully inserted into the seabed sediments. The support pipe then supports and encloses the surrounding sediments, preventing borehole collapse during sampling. Subsequently, sediments inside the support pipe can be collected layer by layer using a smaller sampling tube, achieving layered sampling. This prevents the simultaneous collection of sediments from different layers into the same container, which can lead to mixing and distortion of subsequent sediments within the container. It restores the true layered state of the sediments and minimizes disturbance to the sediments inside the support pipe during operation, resulting in near-original sediment samples.

[0018] 2. The present invention provides a subsea drilling sampling device for preventing collapse of loose sediments. After the support pipe is sunk into the sediment on the seabed, the sampling tube is installed at the lower end of the transmission rod. The motor drives the gear to rotate, and the meshing action drives the transmission rod and the sampling tube to move downward and enter the support pipe. Then the sampling tube is inserted into the sediment and the sediment is forced into the sampling tube. Subsequently, the motor reverses and controls the sampling tube to rise to the outside of the support pipe. The sampling tube is then removed to obtain the sediment sample. By continuously repeating the above operation, and with the sampling tube descending to an increasing height each time, the stratified sampling and extraction of sediment inside the support pipe can be completed.

[0019] 3. The present invention provides a seabed drilling sampling device for preventing collapse of loose sediments. Water inside the sampling tube is first discharged outward through the gap between the elastic pad and the sampling tube and the drainage hole. Then, as the sediment gradually enters the sampling tube and reaches the elastic pad, the sediment squeezes and deforms the elastic pad, causing it to adhere to the inner wall surface of the sampling tube, thereby sealing multiple drainage holes. This prevents the sample inside the sampling tube from leaking outward through the drainage holes during subsequent transportation and also prevents foreign objects from entering the sampling tube and causing contamination. Attached Figure Description

[0020] The invention will now be further described with reference to the accompanying drawings.

[0021] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the structure of the dual-tube isolation sampling assembly in this invention; Figure 3 This is a schematic diagram of the sampling tube in this invention; Figure 4 This is a schematic diagram of the elastic fabric structure in this invention; Figure 5 This is a schematic diagram of the triangular plate in this invention; Figure 6 This is a schematic diagram showing the state of the support pipe of the present invention after it enters the seabed sediment; Figure 7 This is a cross-sectional view of the support pipe and sampling pipe in this invention; Figure 8 yes Figure 7 Enlarged view of a portion of point A in the middle; Figure 9 yes Figure 7 Enlarged view of a section at point B in the middle; Figure 10 yes Figure 9 Enlarged view of a section at point C.

[0022] In the diagram: 1. Suspension platform; 2. Support bracket; 3. Support pipe; 4. Sampling pipe; 5. Guide rod; 6. Force plate; 7. Limiting cylinder; 8. Counterweight; 9. Connecting column; 10. Steel cable; 11. Mounting plate; 12. Transmission rod; 13. Gear; 14. Motor; 15. Connecting block; 16. Drainage hole; 17. Elastic pad; 18. Inner mounting ring; 19. Triangular plate; 20. Guide block one; 21. Electromagnet; 22. Outer mounting ring; 23. Paddle; 24. Guide block two; 25. Elastic cloth; 26. Rubber magnet. Detailed Implementation

[0023] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0024] like Figures 1 to 10 As shown, the present invention provides a seabed drilling and sampling device for preventing collapse of loose sediments, comprising a suspended platform 1, a dual-tube isolation sampling assembly, and a loading assembly; The suspended platform 1 is in a horizontal state; a set of supports 2 are evenly distributed on the surface of the suspended platform 1; the bottom of the supports 2 is fixed to the seabed; The dual-tube isolation sampling assembly is used to sample seabed sediments in an isolated state; the dual-tube isolation sampling assembly includes an outer support tube 3 and an inner sampling tube 4; a set of guide rods 5 are evenly distributed on the top of the support tube 3; the guide rods 5 pass through the suspended platform 1 and are slidably connected to it; a force-bearing plate 6 is fixedly connected to the upper end of the guide rod 5. The loading component is used to intermittently hammer the load-bearing plate 6 and cause the support pipe 3 to enter the seabed sediment.

[0025] Seafloor sediments are typically formed by the accumulation of layers over time. The internal composition of different layers of sediments may differ, such as mineral composition, types of organic matter, microfossils, and biological communities. Therefore, when exploring seafloor sediments, it is best to sample each layer separately to reconstruct their true depositional phenomena. However, existing technologies often fail to achieve the desired results when applied to the above requirements. Due to the geological characteristics of loose sediments, hole collapse is prone to occur during the sampling process, which will hinder the implementation of layered sampling.

[0026] In this invention, the suspended platform 1 and its support 2 are first fixed at a designated location on the seabed. Then, the load-bearing plate 6 is intermittently hammered by the loading component, causing the load-bearing plate 6, guide rod 5, and support pipe 3 to gradually move vertically downwards until the support pipe 3 is completely inserted into the seabed sediment. The support pipe 3 then provides support and enclosure for the surrounding sediment, preventing hole collapse during sampling. Subsequently, the sediment inside the support pipe 3 can be collected layer by layer through the smaller sampling tube 4, achieving layered sampling. This prevents the simultaneous collection of sediment from different layers into the same container, which could lead to mixing and distortion of the sediment inside the container. It restores the true layered state of the sediment and minimizes disturbance to the sediment inside the support pipe 3 during operation, resulting in near-original sediment samples.

[0027] In another embodiment of the present invention, the loading component includes a limiting cylinder 7 fixedly connected to the upper side of the suspension platform 1; the force plate 6 is located inside the limiting cylinder 7; a counterweight 8 is slidably connected inside the limiting cylinder 7; and a connecting column 9 and a steel cable 10 are fixedly connected to the upper end of the counterweight 8 in sequence.

[0028] By intermittently pulling or releasing the steel cable 10 using a ship-borne winch, the hammer 8 is made to reciprocate inside the limiting cylinder 7 and strike the force plate 6, thereby continuously hammering the support pipe 3 into the sediment. This method has less interference with water flow and sediment, can prevent damage to the local seabed topography, and improve the authenticity of sampling. The specific working principle of the loading component can be found in CN222668180U - A undisturbed deep-scale drilling and sampling device for seabed sand and soil sedimentary layers, and will not be elaborated here.

[0029] In another embodiment of the present invention, both the support pipe 3 and the sampling pipe 4 are provided with beveled cutting edges at their bottoms. This facilitates the downward cutting of sediments by the support pipe 3 or the sampling pipe 4, reduces frictional resistance, and lowers the difficulty of drilling and sampling.

[0030] In another embodiment of the present invention, the dual-tube isolation sampling assembly further includes a mounting plate 11, which is fixedly connected to the guide rod 5 and is located below the suspension platform 1. A transmission rod 12 is slidably connected to the middle of the mounting plate 11. A set of toothed blocks are evenly distributed on the surface of the transmission rod 12. A gear 13 is rotatably connected to the surface of the mounting plate 11 and is driven by a motor 14. The gear 13 meshes with the toothed blocks on the surface of the transmission rod 12.

[0031] The upper end of the sampling tube 4 is fixedly connected to a connecting block 15; the connecting block 15 is connected to the lower end of the transmission rod 12 by a thread.

[0032] After the support pipe 3 sinks into the sediment on the seabed, the sampling tube 4 is installed at the lower end of the transmission rod 12. The motor 14 drives the gear 13 to rotate, and the meshing action drives the transmission rod 12 and the sampling tube 4 to move downward and enter the support pipe 3. Then the sampling tube 4 inserts into the sediment and causes the sediment to enter the sampling tube 4. Subsequently, the motor 14 reverses and controls the sampling tube 4 to rise to the outside of the support pipe 3. The sampling tube 4 is then removed to obtain the sediment sample. By continuously repeating the above operation, and with the sampling tube 4 descending to an increasingly higher height each time, the stratified sampling and extraction of sediment inside the support pipe 3 can be completed.

[0033] It is worth noting that when the support pipe 3 sinks due to the hammering action, the connection between the sediments inside and outside the support pipe 3 can be severed, improving the stress state of the sediments. Therefore, sampling the sediments inside the support pipe 3 is easier and does not require hammering. It can be driven by motor 14, which is easier to control and can improve work efficiency.

[0034] In another embodiment of the present invention, a set of drainage holes 16 are evenly distributed on the top side of the sampling tube 4. During the process of sediment entering the sampling tube 4 from the bottom, the water inside the sampling tube 4 can be discharged out through the drainage holes 16, reducing the internal pressure of the sampling tube 4, preventing the sediment sample from being distorted by pressure and increasing the storage capacity.

[0035] An annular elastic pad 17 is fixedly connected to the inner wall of the top of the sampling tube 4 at the position corresponding to the drain hole 16; the elastic pad 17 is inclined upward and there is a gap between it and the inner wall of the sampling tube 4.

[0036] Water inside the sampling tube 4 is first discharged out through the gap between the elastic pad 17 and the sampling tube 4 and the drain hole 16. Then, as the sediment gradually enters the sampling tube 4 and reaches the elastic pad 17, the sediment squeezes and deforms the elastic pad 17 and makes it adhere to the inner wall surface of the sampling tube 4, thereby sealing the multiple drain holes 16. This prevents the sample inside the sampling tube 4 from leaking out through the drain holes 16 during subsequent transportation and also prevents foreign objects from entering the sampling tube 4 and causing contamination.

[0037] In another embodiment of the present invention, an inner mounting ring 18 is fixedly connected to the inner wall of the bottom of the sampling tube 4; a set of triangular plates 19 in a ring array are hinged to the surface of the inner mounting ring 18 by a pivot pin and a torsion spring; a guide block 20 is fixedly connected to the end of the triangular plate 19; an electromagnet 21 is provided at the corresponding position of the guide block 20 inside the side wall of the sampling tube 4.

[0038] An outer mounting ring 22 is fixedly connected to the bottom outer wall of the sampling tube 4; a set of annular array of paddles 23 are hinged to the surface of the outer mounting ring 22 by a pivot pin and a torsion spring, and the number of paddles 23 is the same as that of the triangular plate 19; a guide block 24 is fixedly connected to the end of the paddle 23; an annular elastic cloth 25 is fixedly connected between the outer side of the paddle 23 and the outer mounting ring 22.

[0039] Under normal circumstances, electromagnet 21 is energized, which can maintain the attraction of guide block 1 20 and guide block 24, thereby fixing triangular plate 19 and lever 23 in a vertical position. At this time, the torsion springs at the hinge of triangular plate 19 and lever 23 are in an energy storage state. When the deposit has completely entered the sampling tube 4, electromagnet 21 is de-energized, and guide block 1 20 and guide block 24 lose their attraction at the same time. On the one hand, the torsion spring drives triangular plate 19 to deflect inward and reset to a horizontal position. Multiple triangular plates 19 are pieced together to form a complete circular cross section to seal and preserve the bottom of the sampling tube 4, preventing the deposit inside the sampling tube 4 from falling downward during the lifting process. On the other hand, the torsion spring drives lever 23 to deflect outward and reset, so that multiple levers 23 squeeze the annular elastic cloth 25 outward. The sample tube 4 is deformed and expanded until the elastic cloth 25 is pressed against the inner wall surface of the support tube 3 at an angle. Then, during the lifting process of the sampling tube 4, the deflector 23 and the elastic cloth 25 can be used to carry the sediment between the sampling tube 4 and the support tube 3 upwards. Since this part of the excess sediment is at the same height and has the same composition as the sediment of the current sampling layer, if it is left inside the support tube 3, this part of the sediment is prone to collapse towards the middle after the sampling tube 4 is lifted. During the next sampling, this part of the sediment is likely to be collected into the sampling tube 4 along with the sediment of the next layer. By using the deflector 23 and the unfolded elastic cloth 25 to carry the excess sediment between the sampling tube 4 and the support tube 3 outwards, the above problem can be avoided, and the sampling accuracy of sediments at different heights can be further improved.

[0040] In another embodiment of the present invention, an annular rubber magnet 26 is fixedly connected to the top of the elastic cloth 25. When the elastic cloth 25 moves closer to the side wall of the support pipe 3, the magnetic attraction between the rubber magnet 26 and the support pipe 3 can improve the adhesion between the elastic cloth 25 and the support pipe 3, thereby reducing the leakage of deposits above the elastic cloth 25 downwards and completely removing the deposits between the sampling tube 4 and the support pipe 3 as much as possible.

[0041] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1 Based on the perspective of the observer, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0042] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A subsea drilling and sampling device for preventing collapse of loose sediments, characterized in that: Includes a suspension platform (1), a dual-tube isolation sampling assembly, and a loading assembly; The suspended platform (1) is in a horizontal state; a set of supports (2) are evenly distributed on the surface of the suspended platform (1); the bottom of the supports (2) is fixed to the seabed; The dual-tube isolation sampling assembly is used to sample seabed sediments in an isolated state; the dual-tube isolation sampling assembly includes an outer support tube (3) and an inner sampling tube (4); a set of guide rods (5) are evenly distributed on the top of the support tube (3); the guide rods (5) pass through the suspended platform (1) and are slidably connected to it; a force-bearing plate (6) is fixedly connected to the upper end of the guide rods (5). The loading component is used to intermittently hammer the load-bearing plate (6) and cause the support pipe (3) to enter the seabed sediment.

2. The anti-collapse borehole seabed drilling and sampling device for loose sediments according to claim 1, characterized in that: The loading component includes a limiting cylinder (7) fixedly connected to the upper side of the suspension platform (1); the force plate (6) is located inside the limiting cylinder (7); a weight (8) is slidably connected inside the limiting cylinder (7); a connecting column (9) and a steel cable (10) are fixedly connected to the upper end of the weight (8) in sequence.

3. The anti-collapse borehole seabed drilling and sampling device for loose sediments according to claim 1, characterized in that: Both the support pipe (3) and the sampling pipe (4) have beveled cutting edges at their bottoms.

4. The anti-collapse borehole seabed drilling and sampling device for loose sediments according to claim 1, characterized in that: The dual-tube isolation sampling assembly also includes a mounting plate (11), and the mounting plate (11) is fixedly connected to the guide rod (5); a transmission rod (12) is slidably connected in the middle of the mounting plate (11); a set of tooth blocks are evenly distributed on the surface of the transmission rod (12); a gear (13) is rotatably connected to the surface of the mounting plate (11), and the gear (13) is driven by a motor (14); the gear (13) meshes with the tooth blocks on the surface of the transmission rod (12).

5. The anti-collapse borehole seabed drilling and sampling device for loose sediments according to claim 4, characterized in that: The upper end of the sampling tube (4) is fixedly connected to a connecting block (15); the connecting block (15) is connected to the lower end of the transmission rod (12) by a thread.

6. The anti-collapse borehole seabed drilling and sampling device for loose sediments according to claim 1, characterized in that: A set of drainage holes (16) are evenly distributed on the top side of the sampling tube (4).

7. The anti-collapse borehole seabed drilling and sampling device for loose sediments according to claim 6, characterized in that: The sampling tube (4) has an annular elastic pad (17) fixedly connected to the inner wall of the top at the position corresponding to the drain hole (16); the elastic pad (17) is inclined upward and there is a gap between it and the inner wall of the sampling tube (4).

8. The anti-collapse borehole seabed drilling and sampling device for loose sediments according to claim 1, characterized in that: The sampling tube (4) has an inner mounting ring (18) fixedly connected to the bottom inner wall; a set of triangular plates (19) in a ring array are hinged to the surface of the inner mounting ring (18) by a pivot pin and a torsion spring; a guide block (20) is fixedly connected to the end of the triangular plate (19); an electromagnet (21) is provided at the corresponding position of the guide block (20) inside the side wall of the sampling tube (4).

9. A subsea drilling and sampling device for preventing collapse of loose sediments according to claim 8, characterized in that: The sampling tube (4) has an outer mounting ring (22) fixedly connected to its bottom outer wall; the outer mounting ring (22) has a set of ring array of paddles (23) hinged to its surface by a pivot pin and a torsion spring; the paddles (23) have a guide block (24) fixedly connected to their ends; and a ring of elastic cloth (25) is fixedly connected between the outer side of the paddles (23) and the outer mounting ring (22).

10. A subsea drilling and sampling device for preventing collapse of loose sediments according to claim 9, characterized in that: The top of the elastic cloth (25) is fixedly connected to an annular rubber magnet (26).

Images